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1. Cold Dark Matter

   Linked via "baryonic fluid"

   $\text{CDM}$ plays the role of the initial gravitational scaffold upon which baryonic matter eventually collapses. Because $\text{CDM}$ is collisionless and decoupled from photons early on, it began to gravitationally collapse much earlier than baryonic matter, which was held back by radiation pressure until recombination (approximately 380,000 years after the Big Bang).
   This early collapse is visible in the analysis of the [Cosmic Mic…